Xbase++ Requires Chilkat v11.0.0+

Accept TLS Connection with Client Authentication

See more Socket/SSL/TLS Examples

Demonstrates how to accept a TLS connection requiring client authentication. This is the case where the TLS client sends a certificate. It is also known as "Two-Way SSL". Xbase++

LOCAL nSuccess
LOCAL oListenSslSocket
LOCAL oCert
LOCAL nMyPort
LOCAL nBackLog
LOCAL nMaxWaitMillisec
LOCAL oClientSock
LOCAL cReceivedMsg

nSuccess := 0

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

oListenSslSocket := CreateObject("Chilkat.Socket")

//  An SSL/TLS server needs a digital certificate.  This example loads it from a PFX file.
//  Note: This is the server's certificate.

oCert := CreateObject("Chilkat.Cert")
//  The 1st argument is the file path, the 2nd arg is the 
//  PFX file's password:
nSuccess := oCert:LoadPfxFile("chilkat.pfx", "test")
IF (nSuccess == 0)
    ? oCert:LastErrorText
    oListenSslSocket:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  To accept client client certificates in the TLS handshake,
//  we must indicate a list of acceptable client certificate root CA DN's
//  that are allowed.  (DN is an acronym for Distinguished Name.)
//  Call AddSslAcceptableClientCaDn once for each acceptable CA DN.
//  Here are a few examples so you can see the general format of a DN.
oListenSslSocket:AddSslAcceptableClientCaDn("C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root")
oListenSslSocket:AddSslAcceptableClientCaDn("O=Digital Signature Trust Co., CN=DST Root CA X3")

//  Use the certificate:
nSuccess := oListenSslSocket:InitSslServer(oCert)
IF (nSuccess == 0)
    ? oListenSslSocket:LastErrorText
    oListenSslSocket:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  Bind and listen on a port:
nMyPort := 8123
//  Allow for a max of 5 queued connect requests.
nBackLog := 5
nSuccess := oListenSslSocket:BindAndListen(nMyPort, nBackLog)
IF (nSuccess == 0)
    ? oListenSslSocket:LastErrorText
    oListenSslSocket:destroy()
    oCert:destroy()
    RETURN
ENDIF

//  If accepting an SSL/TLS connection, the SSL handshake is part of the connection
//  establishment process. This involves a few back-and-forth messages between the 
//  client and server to establish algorithms and a shared key to create the secure 
//  channel. The sending and receiving of these messages are governed by the 
//  MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
//  (and this is the default unless changed by your application), then the 
//  AcceptNext can hang indefinitely during the SSL handshake process. 
//  Make sure these properties are set to appropriate values before calling AcceptNext.

//  Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
oListenSslSocket:MaxReadIdleMs := 10000
oListenSslSocket:MaxSendIdleMs := 10000

//  Accept a single client connection and establish the secure SSL/TLS channel:
nMaxWaitMillisec := 20000
oClientSock := CreateObject("Chilkat.Socket")
nSuccess := oListenSslSocket:AcceptNext(nMaxWaitMillisec, oClientSock)
IF (nSuccess == 0)
    ? oListenSslSocket:LastErrorText
    oListenSslSocket:destroy()
    oCert:destroy()
    oClientSock:destroy()
    RETURN
ENDIF

//  The client (in this example) is going to send a "Hello Server! -EOM-" 
//  message.  Read it:
cReceivedMsg := oClientSock:ReceiveUntilMatch("-EOM-")
IF (oClientSock:LastMethodSuccess == 0)
    ? oClientSock:LastErrorText
    oListenSslSocket:destroy()
    oCert:destroy()
    oClientSock:destroy()
    RETURN
ENDIF

? cReceivedMsg

//  Send a "Hello Client! -EOM-" message:
nSuccess := oClientSock:SendString("Hello Client! -EOM-")
IF (nSuccess == 0)
    ? oClientSock:LastErrorText
    oListenSslSocket:destroy()
    oCert:destroy()
    oClientSock:destroy()
    RETURN
ENDIF

//  Close the connection with the client
//  Wait a max of 20 seconds (20000 millsec)
nSuccess := oClientSock:Close(20000)

oListenSslSocket:destroy()
oCert:destroy()
oClientSock:destroy()